Coal-drill



(No Model.) 7

T. HUSBAND;

. GOAL DRILL.

No. 581,558. Patented 27. 1897.

UNITED STATES PATENT OFFICE.

THOMAS HUSBAND, OF EDVVARDSVILLE, PENNSYLVANIA.

COAL-DRILL.

SPECIFICATION forming part of Letters Patent No. 581,558, dated April 2'7, 1897. Application filed February 1, 1897. Serial No. 621,493. (No model.)

To all whom, it may concern:

Be it known that I, THOMAS HUSBAND, a citizen of the United States, and a resident of Edwardsville, in the county of Luzerhe and State of Pennsylvania, have invented certain new and useful Improvements in Coal-Drills and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to drills for use in mining or drilling coal, &c.; and its object is to provide an improved construction of the same which shall possess superior advantages with respect to efficiency in use.

The invention consists, essentially, in a spiral drill-shank having formed at one end a tapering socket provided with two opposite holes, a bit having a tapering head at the inner end formed with a shoulder at one side,

a hole or aperture adapted to register with the openings in the socket, and said head beveled or cut away at the inner end, a cutter at the side of the bit opposite the said shoulder, having a lug at the inner end engaging with said cut-away or beveled portion of the bit, and a pin passing through said holes, the construction being such that the bit may be driven into the socket so as to securely hold it in position, as hereinafter fully described and claimed.

In the accompanying drawings, Figure l is a longitudinal sectional View of a drill construeted in accordance with my invention. Fig. 2 is a similar view of the shank and socket, the bit and cut-ter being removed. Fig. 3 is an elevation of the bit detached. Fig. 4 is a similar view of the cutter.

In the said drawings the reference numeral 1 designates a spiral drill-shank having formed at the end a tapering socket 2, formed with opposite holes 3.

The numeral 3 designates the bit, formed with the usual chisels or cutters 4 at the outer end and at the inner end formed with a tapering head 5, corresponding with the socket. At the outer side the said head is formed with a shoulder 6, by which the bit may be driven into the socket by blows from a hammer or other tool. At the inner end the head is cut away or beveled at 7. The head is formed with a hole 8,which is adapted to register with through the holes in the socket and bit-head. 6 5

The socket is of a size sufficient to admit both the cutter and bit-head, and in use the cutter is first placed in the socket and the bithead then inserted in the socket at one side of the cutter. The bit is now driven into the socket by striking the shoulders 6 with a hammer or other tool, and when driven home the inner end of the head will rest or abut against the end of the socket, clamping the lug of the cutter between the cut-away por-. tion and the end of the socket, and thus firmly securing the cutter in place. The pin is then driven through the holes in the socket and bit-head.

The bit-head should fit snugly in the socket, so that when driven therein it will be securely held in place, and thus insuring the bit making a perfectly straight out, and after thus being driven in the socket the pin will hold the bit and prevent its working loose.

Having thus fully described my invention, what I claim is- In a coal or other drill, the combination with the shank, having a tapering socket at one end formed with tapering holes, of the bit driven into said socket having a tapering head, formed with a hole or aperture, and a shoulder at the outer side and cut away or beveled at the inner end, the rectangular cutter having an inwardly-extending lug engaging with the beveled or cutaway portion of the head and the pin passing through the I holes in the socket and a registering hole in the head, the construction being such that the inner ends of the bit and cutter will have a bearing against the end of the socket, substantially as described' In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

THOMAS HUSBAND.

IOO 

